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Fair Value Measurements - Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets
Debt securities held to maturity	$ 701,676	$ 785,295
Portfolio loans, net	7,764,450	7,634,094
Financial liabilities
Short-term borrowings	12,000	351,054
Junior subordinated debt owed to unconsolidated trusts	71,946	71,810
Level 1 Inputs | Carrying Amount
Financial assets
Cash and cash equivalents	337,919	227,164
Level 1 Inputs | Fair Value
Financial assets
Cash and cash equivalents	337,919	227,164
Level 2 Inputs | Carrying Amount
Financial assets
Debt securities held to maturity	882,614	918,312
Loans held for sale	3,051	1,253
Accrued interest receivable	47,889	43,372
Financial liabilities
Time deposits	1,666,652	855,375
Securities sold under agreements to repurchase	183,702	229,806
Short-term borrowings	12,000	351,054
Long-term debt	21,000	30,000
Junior subordinated debt owed to unconsolidated trusts	71,946	71,810
Accrued interest payable	22,761	3,978
Level 2 Inputs | Fair Value
Financial assets
Debt securities held to maturity	701,676	785,295
Loans held for sale	3,059	1,276
Accrued interest receivable	47,889	43,372
Financial liabilities
Time deposits	1,643,625	830,596
Securities sold under agreements to repurchase	183,702	229,806
Short-term borrowings	12,027	351,085
Long-term debt	21,020	30,052
Junior subordinated debt owed to unconsolidated trusts	55,662	59,111
Accrued interest payable	22,761	3,978
Level 3 Inputs | Carrying Amount
Financial assets
Portfolio loans, net	7,764,450	7,634,094
Mortgage servicing rights	3,870	5,861
Other servicing rights	1,675	1,914
Level 3 Inputs | Fair Value
Financial assets
Portfolio loans, net	7,241,479	7,320,422
Mortgage servicing rights	18,758	18,284
Other servicing rights	2,144	2,331
Level 3 Inputs | Subordinated Debt | Carrying Amount
Financial liabilities
Long-term debt	222,666	222,038
Level 3 Inputs | Subordinated Debt | Fair Value
Financial liabilities
Long-term debt	$ 198,812	$ 208,562

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